Disclaimer: Don't own Death Note, never will.
SO. I've rewritten a few holiday-ish themed Christmas carols, so here's the one for Death Note. Enjoy.
Death the Halls (To the tune of Deck the Halls)
Deck the halls with shinigami
fa la la la la la la la la
Kill L and the boys at Wammy's
fa la la la la la la la la
Christmas fluff and innuendoes
fa la la la la la la la la
Kira sings his twisted carols
fa la la la la la la la la
See the flaming boys before us
fa la la la la la la la la
L will eat the fruitcake for us
fa la la la la la la la la
Gifts of chocolate, books and apples
fa la la la la la la la la
Making crazy Ryuk cackle
fa la la la la la la la la
Mistletoe with L and Light
fa la la la la la la la la
Could end in a bloody fight
fa la la la la la la la la
But the fangirls all are clued in
fa la la la la la la la la
Matsuda is being stupid
fa la la la la la la la la
Hope you enjoyed my little song failure. The reason for the 3rd line in the last verse is because I had nothing else that even remotely sounded like 'stupid'.